<!DOCTYPE html>
<html lang=en>
<head>
    <meta charset=utf-8>
    <title>Screen Stream</title>
    <style>body,html{height:80%}html{display:table;margin:auto;font-family:sans-serif}body{display:table-cell;vertical-align:middle;background:#EEE;text-align:center}</style>
</head>
<body><p>stream_require_pin</p>
<form action=/ autocomplete=off>enter_pin<input autofocus maxlength=4 name=pin pattern=[0-9]{4} required size=4 title="four_digits" type=password>
 <button type=submit>submit_text</button>
</form>
<p style=color:red;font-weight:700>wrong_pin</p>
</body>
</html>